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CRITICAL MECHANICAL PROPERTIES OF STRUCTURAL LIGHTWEIGHT CONCRETE AND THEIR EFFECTS ON PAVEMENT DESIGN

THIS STUDY EXAMINES THE CRITICAL MECHANICAL PROPERTIES OF STRUCTURAL LIGHTWEIGHT CONCRETE WHICH MIGHT AFFECT THE PERFORMANCE OF CONCRETE PAVEMENTS. THE PROPERTIES RESULTING FROM UNRESTRAINED AND RESTRAINED VOLUME CHANGE ARE PRESENTED, WITH PARTICULAR ATTENTION GIVEN TO COMPRESSIVE, DIRECT TENSILE, AND INDIRECT TENSIL /SPLIT CYLINDER/ STRENGTHS AT VARIOUS AGES OF THE CONCRETE. THE CRITICAL PROPERTIES DETERMINED IN THIS STUDY INDICATE THAT CONCRETE PAVEMENTS CAN BE DESIGNED WITH LIGHTWEIGHT CONCRETE, AND THAT EXPECTED PERFORMANCE FROM THE EFFECTS OF WARPING STRESSES AND PAVEMENTS DEFLECTION WILL BE BETTER THAN THAT OF PAVEMENTS MADE WITH REGULAR WEIGHT CONCRETE. HOWEVER, THE EFFECTS OF RESTRAINED VOLUME CHANGE OF LIGHTWEIGHT CONCRETE ON PAVEMENT PERFORMANCE CAN BE DETRIMENTAL IF IMPROPER CURING, OR CURING FOR TOO SHORT A TIME, OCCURS. THE NEED FOR FURTHER RESEARCH ON THE EFFECTS OF CURING ON LIGHTWEIGHT CONCRETE PAVEMENT PERFORMANCE IS EMPHASIZED. /AUTHOR/